Table shows acoustic impedance of various mediums such as air, water or marble.

Frequency generator

sine↔square↔sawtooth↔triangle↔etc.

Generates sound with specified frequency and waveform type (sine, triangle etc.).

Mass law: double wall

air gap↔double wall↔wall-air-wall↔room within the room↔mass-air-mass↔transmission loss (TL)

Calculator finds out sound reduction in decibels (dB) for double layer wall with given density, thickness and air gap width using so-called mass law equation.

Mass law: single wall

surface density↔wall thickness↔single wall↔sound reduction index (SRI)↔transmission loss (TL)

Calculator finds out sound reduction in decibels (dB) for single layer wall with given density and thickness using so-called mass law equation.

Noise propagation

noise propagation↔sound source↔distance↔loudness at distance

Calculator finds out sound wave at given distance from source with given sound pressure level.

Note frequencies

basic tone↔1-st harmonic↔2-nd harmonic↔3-rd harmonic↔etc.

Table shows frequencies of music notes in twelve-tone equal tempered system (12-TET). Both basic tone and up to three harmonic frequencies are presented.

Periodic signals

sine↔triangle↔square↔mean value↔shape factor↔effective value↔etc.

Table shows properties of common periodic signals (sine, square, triangle etc.) such as absolute mean value, effective value or shape factor.

Sound absorption coefficients

sound absoprption↔building materials↔reverbation↔damping↔room coloration

Table shows sound absorption coefficient for different building materials.

Sound insulation countours

STC↔Rw↔weighted SRI↔countour↔ASTM E-90↔ISO 717↔etc.

Table shows spectral contour used to measure sound insulation in various standards such as STC or Rw.

Sound intensity level (dB)

sound level↔decibel↔logarithmic scale↔noise level↔acoustic pressure↔etc.

Table shows examples of sound sources with various intensity level given in decibels.

Sound reduction index (SRI)

Rw↔weighted sound reduction index↔SRI↔sound insulation↔sound-proofing↔transmission loss

Table shows sound reduction indexes (SRI) for common materials.

Sound transmission class (STC)

STC↔weighted sound reduction index↔sound insulation↔sound-proofing↔transmission loss

Table shows sound transmission classs (STC) for common building materials.

Table shows speed of sound within medium compound of various materials such as air, steel or water.

Sound wave reflection

sound wave↔impedance difference↔reflection coefficient

Calculator finds out sound reflection coefficient between two mediums e.g. air-concrete or steel-steel